Summary
The nine eigenfrequencies of sylvine are evaluated, and it is shown that the wave-length at which the maximum absorption is exhibited by very thin films is much nearer the tirst than the third of them which is the so-called active oscillation of the potassium against the chlorine atoms. The absorption and reflection data over the whole range of wave-lengths are in general accord with the indications of the theory. The force-constants for sylvine are a little smaller than for rock-salt.
References
BarnesZeit. f. Physik., 1932,75, 729.
CzernyIbid.,, 1930,65, 600.
MentzelIbid.,, 1934,88, 178.
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Raman, C.V. The vibration spectra of crystals. Proc. Indian Acad. Sci. 26, 396 (1947). https://doi.org/10.1007/BF03170897
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DOI: https://doi.org/10.1007/BF03170897